the dates MARCH 21 & SEPTEMBER 21 are called the... equinoxes, the seasonal progressions or solstices? HELP!?

Answer 1

they are called the spring equinox and fall equinox respectively...

Answer 2

The sun reaches its greatest distance north or south of the equator twice each year. Each of these dyas, when the sun is farthest north or south of the equator is known as a solstice. The day when the sun is farthest north of the equator is the summer solstice in the Northern Hemisphere. It occurs around June 21 each year. It is the longest day of the year in the Northern Hemisphere. Around December 21, the sun is farthest south of the equator. This is the winter solstice in the Northern Hemisphere.

Halway between the solstices, neither hemisphere is tilted toward or away from the sun. This occurs twice a year, when the noon sun is directly overhead at the equator. Each of these days is known as an equinox, which means "equal night." During an equinox, day and night are each about 12 hours long everywhere on Earth. The vernal (spring) equinox occurs around March 21 and marks the beginning of spring in the Northern Hemisphere. The autumnal (fall) equinox occurs around September 22. It marks the beginning of fall in the Northern Hemisphere.

Answer 3

I'm a bit confused by your question. The equinoxes (2 per calendar year - one in the spring and one in the fall) are when the length of day equals the length night. The solstices (2 per calendar year) are when either the length of day or the length of night are the longest. Winter solstice is longest night and occurs around Dec 22 and summer solstice is longest day and is around June 21 (Dates for the solstices and equinoxes can vary by 1 day due to calendar adjustment, e.g. leap year.).

Progression is solstice, equinox, solstice, equinox, ad infinitum.

Winter is from the winter solstice to the spring equinox.
Spring is from the spring equinox to the summer solstice.
Summer is from the summer solstice to the fall equinox.
Fall is from the fall equinox to the winter solstice.
Repeat!

Answer 4

answerer above me has a point. the day is equal, but also the earth has absolutely no tilt towards or away from the sun. it is rotating upright.

There is a myth that is said how you can balance an egg on the small side during the equinox where another day it would roll back on its wide oval side. My ecology teacher tried this back in HS with my class on the day of the equinox and the next day it did not roll back on its side. she took another egg and balanced after the equinox is over and was able to do the same thing.

Answer 5

spring and fall equinox. The solstices are in June and Decemeber marking the beginning of winter and summer (december 21 and june 21 respectively).

Answer 6

21st of september is my birthday : it is not the automn equinox which is on the 22nd or 23rd of September depending on the year.
21st of march can be the spring equinox depending on the year. It can also happen on the 20th of march.
Equinoxes are when the night and the day have roughly the same duration.
This is the simplest I can do.

Answer 7

Vernal and Atumnal Equinoxes